<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<style>
    .header,.footer{
        background: palegreen;
        height: 60px;
    }
    .container{
        overflow: hidden;
    }
    .middle, .left,.right{
        min-height: 300px;
        float: left;
    }
    .middle{
        width: 100%;
        /* margin: 0 200px 0 220px; */
    }
    .inner{
        margin: 0 200px 0 220px;
        background: palegreen;
        height: 200px;
    }
    .left{
        width: 220px;
        margin-left: -100%;
        background: purple;
    }
    .right{
        width: 200px;
        margin-left: -200px;
        background: palevioletred;
    }
</style>
<body>
    <div class="header"></div>
    <div class="container">
        <div class="middle">
            <div class="inner">middle</div>
        </div>
        <div class="left">left</div>
        <div class="right">right</div>
    </div>
    <div class="footer"></div>
</body>
</html>